/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file    stm32f1xx_it.c
  * @brief   Interrupt Service Routines.
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2025 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file
  * in the root directory of this software component.
  * If no LICENSE file comes with this software, it is provided AS-IS.
  *
  ******************************************************************************
  */
/* USER CODE END Header */

/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "stm32f1xx_it.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN TD */
typedef enum
{
	KEY_STATE_PRESSED,
	KEY_STATE_RELEASED
} key_state_t;
/* USER CODE END TD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
#define KEY_DEBOUNCE_TIME 10
/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/
/* USER CODE BEGIN PV */

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
/* USER CODE BEGIN PFP */

/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */

/* USER CODE END 0 */

/* External variables --------------------------------------------------------*/

/* USER CODE BEGIN EV */

/* USER CODE END EV */

/******************************************************************************/
/*           Cortex-M3 Processor Interruption and Exception Handlers          */
/******************************************************************************/
/**
  * @brief This function handles Non maskable interrupt.
  */
void NMI_Handler(void)
{
  /* USER CODE BEGIN NonMaskableInt_IRQn 0 */

  /* USER CODE END NonMaskableInt_IRQn 0 */
  /* USER CODE BEGIN NonMaskableInt_IRQn 1 */
   while (1)
  {
  }
  /* USER CODE END NonMaskableInt_IRQn 1 */
}

/**
  * @brief This function handles Hard fault interrupt.
  */
void HardFault_Handler(void)
{
  /* USER CODE BEGIN HardFault_IRQn 0 */

  /* USER CODE END HardFault_IRQn 0 */
  while (1)
  {
    /* USER CODE BEGIN W1_HardFault_IRQn 0 */
    /* USER CODE END W1_HardFault_IRQn 0 */
  }
}

/**
  * @brief This function handles Memory management fault.
  */
void MemManage_Handler(void)
{
  /* USER CODE BEGIN MemoryManagement_IRQn 0 */

  /* USER CODE END MemoryManagement_IRQn 0 */
  while (1)
  {
    /* USER CODE BEGIN W1_MemoryManagement_IRQn 0 */
    /* USER CODE END W1_MemoryManagement_IRQn 0 */
  }
}

/**
  * @brief This function handles Prefetch fault, memory access fault.
  */
void BusFault_Handler(void)
{
  /* USER CODE BEGIN BusFault_IRQn 0 */

  /* USER CODE END BusFault_IRQn 0 */
  while (1)
  {
    /* USER CODE BEGIN W1_BusFault_IRQn 0 */
    /* USER CODE END W1_BusFault_IRQn 0 */
  }
}

/**
  * @brief This function handles Undefined instruction or illegal state.
  */
void UsageFault_Handler(void)
{
  /* USER CODE BEGIN UsageFault_IRQn 0 */

  /* USER CODE END UsageFault_IRQn 0 */
  while (1)
  {
    /* USER CODE BEGIN W1_UsageFault_IRQn 0 */
    /* USER CODE END W1_UsageFault_IRQn 0 */
  }
}

/**
  * @brief This function handles System service call via SWI instruction.
  */
void SVC_Handler(void)
{
  /* USER CODE BEGIN SVCall_IRQn 0 */

  /* USER CODE END SVCall_IRQn 0 */
  /* USER CODE BEGIN SVCall_IRQn 1 */

  /* USER CODE END SVCall_IRQn 1 */
}

/**
  * @brief This function handles Debug monitor.
  */
void DebugMon_Handler(void)
{
  /* USER CODE BEGIN DebugMonitor_IRQn 0 */

  /* USER CODE END DebugMonitor_IRQn 0 */
  /* USER CODE BEGIN DebugMonitor_IRQn 1 */

  /* USER CODE END DebugMonitor_IRQn 1 */
}

/**
  * @brief This function handles Pendable request for system service.
  */
void PendSV_Handler(void)
{
  /* USER CODE BEGIN PendSV_IRQn 0 */

  /* USER CODE END PendSV_IRQn 0 */
  /* USER CODE BEGIN PendSV_IRQn 1 */

  /* USER CODE END PendSV_IRQn 1 */
}

/**
  * @brief This function handles System tick timer.
  */
void SysTick_Handler(void)
{
  /* USER CODE BEGIN SysTick_IRQn 0 */

  /* USER CODE END SysTick_IRQn 0 */
  HAL_IncTick();
  /* USER CODE BEGIN SysTick_IRQn 1 */

  /* USER CODE END SysTick_IRQn 1 */
}

/******************************************************************************/
/* STM32F1xx Peripheral Interrupt Handlers                                    */
/* Add here the Interrupt Handlers for the used peripherals.                  */
/* For the available peripheral interrupt handler names,                      */
/* please refer to the startup file (startup_stm32f1xx.s).                    */
/******************************************************************************/

/**
  * @brief This function handles EXTI line0 interrupt.
  */
void EXTI0_IRQHandler(void)
{
  /* USER CODE BEGIN EXTI0_IRQn 0 */

  /* USER CODE END EXTI0_IRQn 0 */
  HAL_GPIO_EXTI_IRQHandler(GPIO_PIN_0);
  /* USER CODE BEGIN EXTI0_IRQn 1 */

  /* USER CODE END EXTI0_IRQn 1 */
}

/**
  * @brief This function handles EXTI line[9:5] interrupts.
  */
void EXTI9_5_IRQHandler(void)
{
  /* USER CODE BEGIN EXTI9_5_IRQn 0 */

  /* USER CODE END EXTI9_5_IRQn 0 */
  HAL_GPIO_EXTI_IRQHandler(GPIO_PIN_8);
  HAL_GPIO_EXTI_IRQHandler(GPIO_PIN_9);
  /* USER CODE BEGIN EXTI9_5_IRQn 1 */

  /* USER CODE END EXTI9_5_IRQn 1 */
}

/* USER CODE BEGIN 1 */
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
	static key_state_t key1_state = KEY_STATE_RELEASED, key3_state = KEY_STATE_RELEASED;
	static uint32_t key1_prev_time = 0, key3_prev_time = 0;
	
	uint32_t cur_time = HAL_GetTick();


	if(GPIO_Pin == GPIO_PIN_9)
	{
		// 检测按键 KEY1
		GPIO_PinState pin_state = HAL_GPIO_ReadPin(GPIOC, GPIO_PIN_9);
		
		switch(key1_state)
		{
			case KEY_STATE_RELEASED:
			{
				if(pin_state == GPIO_PIN_RESET)
				{
					// 如果是下降沿
					if(cur_time - key1_prev_time > KEY_DEBOUNCE_TIME)
					{
						// 切换按键 KEY1 的状态为按下状态
						key1_state = KEY_STATE_PRESSED;
						
						key1_prev_time = cur_time;
						
						// 需要执行的操作
						// 增加一档亮度
						// ...
						light += 20;
						if(light > 100) light = 100;
					}
				}
			}
			break;
			
			case KEY_STATE_PRESSED:
			{
				if(pin_state == GPIO_PIN_SET)
				{
					// 如果是上升沿
					if(cur_time - key1_prev_time > KEY_DEBOUNCE_TIME)
					{
						// 切换按键 KEY1 的状态为释放状态
						key1_state = KEY_STATE_RELEASED;
						
						key1_prev_time = cur_time;
						// 需要执行的操作
						// ...
					}
				}
			}
			break;
		}
	}
	else if(GPIO_Pin == GPIO_PIN_0)
	{
		// 检测按键 KEY3
		GPIO_PinState pin_state = HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_0);
		
		switch(key3_state)
		{
			case KEY_STATE_RELEASED:
			{
				if(pin_state == GPIO_PIN_SET)
				{
					// 如果是上升沿
					if(cur_time - key3_prev_time > KEY_DEBOUNCE_TIME)
					{
						// 切换按键 KEY3 的状态为按下状态
						key3_state = KEY_STATE_PRESSED;
						
						key3_prev_time = cur_time;
						
						// 需要执行的操作
						// 减少一档亮度
						// ...
						light -= 20;
						if(light < 0) light = 0;
					}
				}
			}
			break;
			
			case KEY_STATE_PRESSED:
			{
				if(pin_state == GPIO_PIN_RESET)
				{
					// 如果是下降沿
					if(cur_time - key3_prev_time > KEY_DEBOUNCE_TIME)
					{
						// 切换按键 KEY3 的状态为释放状态
						key3_state = KEY_STATE_RELEASED;
						
						key3_prev_time = cur_time;
						// 需要执行的操作
						// ...
					}
				}
			}
			break;
		}		
	}
}
/* USER CODE END 1 */
